List of top Chemistry Questions asked in Maharashtra Class XII

Write the structural formula of N, N-dimethylethanamine.
What is the molality of an aqueous solution of KBr having freezing point -3.72\(^\circ\)C (K\(_f\) for water is 1.86 K kg mol\(^{-1}\))?
Write the names of the metal elements in brass alloy.
Write the number of donor atoms present in EDTA, during formation of complex.
The rate law equation for A \(\rightarrow\) Product, is rate = k[A]\(^x\). What is the effect of increase in concentration of 'A' on rate of reaction, if x<0?
The highest acidic compound among the following is _______.
Which of the following is a secondary amine?
Which formula co-relates degree of dissociation and concentration of electrolyte?
The formula used to calculate molar conductivity of an electrolyte is _______.
One dimensional nanostructure amongst the following is _______.
The value of \( \Delta n_g \) for the oxidation of 4 mole of sulphur dioxide to sulphur trioxide is _______.
Ozone layer is depleted by _______.
The freezing point of 0.1m aqueous solution of urea, if \( K_f \) for water is 1.86 K kg mol\(^{-1}\) is _______.
When excess of AgNO\(_3\) is added to a complex, one mole of AgCl is precipitated. The formula of complex is _______.
What is a nanomaterial? Write the reaction involved in the sol-gel process during hydrolysis.
Identify ‘A’, ‘B’ and ‘C’ in the following chain reaction and rewrite the chemical reactions: \[ CH_3CH_2OH \xrightarrow{\text{red P}, \, Br_2} A \xrightarrow{\text{KCN, alc.}} B \xrightarrow{\text{LiAlH}_4, \text{Ether}} C \]
Define Lanthanide contraction. Write the balanced chemical equation when acidified \( K_2Cr_2O_7 \) reacts with \( H_2S \).
Derive an expression for maximum work obtainable during isothermal reversible expansion of an ideal gas from initial volume \( V_1 \) to final volume \( V_2 \).

If the unit of the rate constant is \( \text{mol} \, (\text{dm}^{-3} \text{s}^{-1}) \), the order of the reaction would be ____________.

Silver Nitrite
What are interhalogen compounds? Write the chemical reaction when chlorine reacts with dry slaked lime.
Why are amines basic in nature? Among dimethylamine (pK$_b$ = 3.27) and diethylamine (pK$_b$ = 3.0), which one is more basic?
Explain Wolff-Kishner reduction reaction. Write the preparation of propanone by using ethanoyl chloride and dimethyl cadmium.
Calculate the effective atomic number (EAN) of \( [Co(NH_3)_6]^{3+} \) ion.

Write the name of the metal nanoparticle used to remove E. coli bacteria from water.